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A Blue Chalcedony ring. Lose yourself in the heavenly radiance of this Chalcedony ring, combined with the innocent purity of White Gold it gives the effect of a full moon lit up by bright stars. Chalcedony 12.16cts.
Chalcedony is a
cryptocrystalline form of silica,
composed of very fine intergrowths of the minerals quartz and moganite. These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, whilst moganite is monoclinic. Chalcedony
has
a waxy lustre, and may be
semitransparent or translucent. Its colour is usually white to gray, grayish-blue or a shade of brown ranging from pale to nearly black. Other shades have been given specific names: A clear red chalcedony is known as
carnelian or sard. A green
variety coloured by nickel oxide is called chrysoprase. Prase is a dull green. Onyx has flat black and white bands. Plasma is a bright to emerald-green chalcedony that is sometimes found with small yellow spots of
jasper.
Heliotrope is similar to
plasma, but with red spots of jasper, hence its alternative name of bloodstone. Chalcedony with concentric banding is known as agate. Flint is also a variety of chalcedony.
People living along the Central
Asian
trade routes used various forms
of chalcedony, including carnelian, to carve intaglios, ring bezels (the upper faceted portion of a gem projecting from the ring setting), and beads that show strong Graeco-Roman influence. Fine examples of
first
century objects made from chalcedony,
possibly Kushan, were found in recent years at Tillya-tepe in north-western Afghanistan. Hot wax would not stick to it so it was often used to make seal impressions.
The term chalcedony is derived
from
the name of the ancient Greek town
Chalkedon in Asia Minor, in modern English usually spelled Chalcedon, today the Kadık”y district of Istanbul.
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B0867
A Blue Chalcedony ring. A Round Chalcedony set as an 18ct White Gold Chalcedony Ring. Rub over setting. 18kt
price: £1,250.00 |
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